I had some free time today, so I managed a way down to the DPFE sensor, I removed some things to have an easy access to the sensor. I unplugged the plug and both tubes, then I noticed the sensor is not the same as the one in the picture and is different to the one the previous owner gave me.
I took pics when I was there so we can see the difference there is between the 2 sensors.
So I put everything back in its place since I couldn't do anything. When I started the car after, the check engine light was gone. I went for a ride and the check engine light did not show up. I guess the plug was probably not inserted correctly in the sensor and that it's now alright since I put it back on. I don't know if it was the problem and I don't know if the check engine light will come back on soon, I just hope things will be alright for now.
I just need to fill the engine coolant a little bit now.